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What response will you get from an ACK Scan if a stateless firewall is in front of the host you are scanning?
Not possible to do an ACK only scan
RST
ACK
SYN
No Response; Packet will be dropped
A stateless firewall will allow ACK packets through to the host and the host will send RST packets back since it never sent a matching SYN. A stateful firewall would silently drop packets and you would get no response back. EDIT: No response or RST? Please clarify EDIT: Read the question carefully it is asking about stateless firewall not the stateful firewall. So the answer is correct and the explanation is also good.
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